What is the best breed of dog for obedience training?

I need 2 dogs for a training program for a school and I am having touble thinking of the beed to buy. I wanted to stay away from the most common choices like golden retreivers and labs, and go for a different breed.

I need one breed that would be awesome around people and great in obedience trials

I also need a different breed to do scent detection, It must have a high ball drive.

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